Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Switch: Double press switch (front lamp switch+tail lamp switch), Waterproof grade: IPX4, Material: ABS + PC + nylon double grid, Department Name: Unisex, Net weight: 125g, Tail light – 3 gears: 4LED red light – 6LED white light – 4LED red light – 6LED white light flashes alternately / any gear stays for more than 8 seconds / click the switch to return to this gear, Charging mode: Type-C USB charging, Indicator lights: 4 blue LED indicators / 25% – 50% – 75% – 100% / flashing in turn when charging / fully on when fully charged, Gear position: COB – 5 gears: COB strong light – COB weak light – COB flashing – COB red light – COB red light flashing / any gear stays for more than 8 seconds / click the switch to return to this gear, Range: 50-100m, Material: Polyester, Application Position: Waist, Zoom mode: None, Body size: 45x35x9.5cm/16.93×13.78×3.74in(length 94cm/37.01in), Lumens: 300LM, Model Number: Running Waist Bags, Bulb: COB (white light+red light)+6COB (white light)+4LED (red light), Battery: Built-in 1200mA polymer battery, Endurance: 3-5 hours
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood).
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG3b4ea1, BG589b2e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for Running Belt Bag with LED Light Waterproof? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).